Gray bamboo shark
| Gray bamboo shark | ||||||||||||
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Gray bamboo shark ( Chiloscyllium griseum ) |
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| Chiloscyllium griseum | ||||||||||||
| Müller & Henle , 1838 |
The gray bamboo shark ( Chiloscyllium griseum ) is a shark from the bamboo shark family (Hemiscylliidae).
features
The species reaches a maximum length of 77 centimeters, adult animals usually measure between 50 and 60 centimeters. The body and tail are slender like other species of the genus, it has no ridges on the sides of the body. The shark is mostly evenly colored in gray and has no pattern on the body or fins. In the young animals, saddle marks and bands can be formed on the body, but they are not sharply delimited.
The mouth lies clearly in front of the eyes, which are quite large for the species. Both the dorsal fins and the anal fin start very far back on the body. The first dorsal fin starts above the pelvic fins or directly behind them and the beginning of the anal fin is far behind the end of the second dorsal fin. The rear edge of the dorsal fins is straight to slightly convex.
distribution and habitat
The gray bamboo shark lives in large parts of the coastal area of the Indian Ocean off India , Sri Lanka , Singapore , Malaysia and Thailand . Evidence to the east from Indonesia to New Guinea is likely to be from the Indonesian bamboo shark ( C. hasselti )
It lives on the continental shelf near the coast and in lagoons and occurs at depths of 5 to 80 meters.
Way of life
Comparatively little is known about the way of life of the slim bamboo shark. Like related species, it probably feeds primarily on invertebrates. The species is oviparous and lays small, oval eggs on the seabed. The young sharks hatch with a length of about 12 centimeters and the animals reach sexual maturity with a length of 45 to 55 centimeters.
Relationship to people
The small sharks are classified as harmless to humans due to their small size. Often caught by inshore fishermen in India, Sri Lanka and other countries where it is used for food, it can be affected by overfishing and major changes in its habitats near the coast, particularly coral reef destruction . Since little is known about this shark's way of life and reproduction, it is believed to be sensitive to increased fishing pressure. The International Union for Conservation of Nature (IUCN) puts the species on the early warning list (“Near Threatened”) of endangered species.
Individual evidence
- ↑ Chiloscyllium griseum in the IUCN Red List of Threatened Species 2010.2. Listed by: Lisney, TJ & Cavanagh, RD (SSG Australia & Oceania Regional Workshop, March 2003), 2003. Retrieved July 2, 2010.
literature
- LJV Compagno : Sharks of the world. An annotated and illustrated catalog of shark species known to date. Volume 2. Bullhead, mackerel and carpet sharks (Heterodontiformes, Lamniformes and Orectolobiformes). FAO Species Catalog for Fishery Purposes. No. 1, Vol. 2. FAO Rome 2001 ( complete PDF , species portrait )
- Leonard Compagno, Marc Dando, Sarah Fowler: Sharks of the World. Princeton Field Guides, Princeton University Press , Princeton and Oxford 2005, page 167, ISBN 978-0-691-12072-0
Web links
- Gray bamboo shark on Fishbase.org (English)